[chihuahua]

I think burning PVC can produce dioxin, which would be very bad if it's not filtered out from the exhaust. Then it depends on how much you trust the facility to have an effective filter installed, and test and maintain it diligently. That costs money, so there will be a tendency to skip the maintenance.

[Tuna-Fish]

No. Only partial combustion of PVC produces dioxins. Proper incineration plants do not produce any. So the solution is not filters, but hotter combustion.